Must have parachute
Everyone sits around the parachute with their legs put underneath except for one shark (who is under the parachute) and one life guard (who is standing outside of the circle) the shark tries to pull the campers under while the lifeguard tries to save them. If pulled under, they become sharks. If rescued, they become lifeguards. The game is over when everyone has been either rescued or pulled under, and the team with the most at the end is the winner.
Its best to play with tough kids because it can get a little rough.